Worked on the uutils/coreutils repository, focusing on improving the reliability of the Numfmt utility by addressing a rounding inaccuracy affecting small scaled values. Applied expertise in Rust and system programming to implement a precise bug fix, ensuring that numeric formatting now handles edge cases correctly. Developed and integrated regression tests to validate the new behavior, emphasizing a test-driven approach and maintaining robust coverage. Ensured that all changes passed continuous integration checks without introducing performance regressions. This work enhanced the accuracy and dependability of numeric formatting in the utility, contributing to more reliable system tools and improved code quality overall.